(4/2)^2*3.14*10*(1/3)*7.8=41.9cm^3 41.9*7.8=326.82g 326.82g=0.32682kg
体积：3.14*(4÷2)²*10÷3=3.14*4*10÷3=12.56*10÷3=125.6÷3=1256/30立方厘米重量：7.8*1256/30=7.8÷30*1256=0.26*1256=326.56克=0.32656千克【润无声】为你解...
